package com.myex.demo.common;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextHolder implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        SpringContextHolder.applicationContext = applicationContext;
    }

    public static ApplicationContext getApplicationContext(){
        assertApplicationContext();
        return applicationContext;
    }



    public static <T> T getBean(String beanName){
        assertApplicationContext();
        return (T) applicationContext.getBean(beanName);
    }


    public static <T> T getBean(Class<T> requiredType){
        assertApplicationContext();
        return applicationContext.getBean(requiredType);

    }


    private static void assertApplicationContext() {
        if (SpringContextHolder.applicationContext == null){
            throw new RuntimeException("applicationContext属性为null，请检查是否注入了SpringContextHolder");
        }
    }


}
